| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 48°F | 35°F | 1.4" |
| February | 28°F | 55°F | 40°F | 1.1" |
| March | 32°F | 62°F | 46°F | 0.6" |
| April | 37°F | 68°F | 51°F | 0.5" |
| May | 45°F | 76°F | 60°F | 0.6" |
| June | 53°F | 87°F | 70°F | 0.3" |
| July | 61°F | 96°F | 79°F | 0.3" |
| August | 58°F | 93°F | 76°F | 0.2" |
| September | 50°F | 86°F | 67°F | 0.1" |
| October | 40°F | 73°F | 55°F | 0.8" |
| November | 30°F | 60°F | 44°F | 0.6" |
| December | 23°F | 48°F | 35°F | 1.1" |
| Index | Sparks | Nevada | National |
| Air quality index | 46 | 38 | 42 |
| Pollution index | 26,667,300 | 2,601,914 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 244 |
| Days with moderate air quality | 121 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.360% |
| Benzene | 0.250% |
| Carbon Tetrachloride | 0.100% |
| Lead | 0.250% |
| Mercury | 0.260% |
| City | Population | Air Quality Index | National Avg. |
| Floriston, CA | 28 | 44 | 12.0% |
| Verdi, NV | 1,161 | 46 | 8.0% |
| Spanish Springs, NV | 15,820 | 46 | 8.0% |
| Cold Springs, NV | 10,704 | 46 | 8.0% |
| Sun Valley, NV | 21,179 | 46 | 8.0% |
| Sparks, NV | 102,895 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Las Cruces, NM | 102,950 | 51 | 2.0% |
| South Bend, IN | 102,686 | 42 | 16.0% |
| El Cajon, CA | 103,249 | 64 | 28.0% |
| Burbank, CA | 103,411 | 72 | 44.0% |
| Rialto, CA | 103,549 | 89 | 78.0% |
| Sparks, NV | 102,895 | 46 | 8.0% |
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